Add styles for accounts create page.

I noticed that if validation fails when creating an account, it shoots you to this page:

![screenshot 2014-12-23 12 33 55](https://cloud.githubusercontent.com/assets/816517/5541223/1d3604e4-8aa3-11e4-8218-8a64c85b2686.png)

So, I updated the styles to include the body class for that page as well. That way you get this:

![screenshot 2014-12-23 12 54 19](https://cloud.githubusercontent.com/assets/816517/5541234/3866bd30-8aa3-11e4-868c-46373be3926d.png)